Casting backing



Oct. 25, 1932. 5 J KRlVlG 1,883,969

CASTING BACKING Filed June 30, 1931 Patented Oct. 25, 1932 UNlTED STATES STEPHEN J. KRIVIG,

OF HILLSIDE, NEW JERSEY, ASSIGNOR T BAKER 8t COMPANY,

INC., 01: NEWARK, NEW JERSEY, ACQRFORATION OF NEW JERSEY CASTING BACKING Application filed June 30,

- other dentures.

One object of the invention is to provide a casting backing embodying novel and 1m proved features of construction whereby the casting backing shall be securely interlocked or bonded with the casting metal or solder.

Other objects are to provide a casting backing for artificial teeth comprising a plate having on one side a plurality of undercut recesses extending across the plate and opening through the edges thereof to receive and interlock with casting metal or solder, and having on the opposite side means, for example a post, for holding a tooth; to provide such a casting backing wherein said recesses form projections having surfaces in spaced and opposed relation to the general plane of said side of the plate to interlock with casting metal or solder, While the opposite side of the plate has means to hold a tooth; to provide a casting backing of this character which shall be simple and inexpensive in construction and reliable in use; and to obtain other advantages and results as will be brought out by the following description.

Referring to the accompanying drawing, in which corresponding and like characters designate the same parts throughout the several views,

Figure 1 is a vertical longitudinal sectional view through a casting having a casting backing secured thereto and shown in side elevation;

Figure 2 is a fragmentary vertical sectional view, on the line 22 of Figure 1;

Figure 3 is a horizontal sectional View, on the line 33 of Figure 1;

Figure 4 is an enlarged detached perspective view of the casting backing;

Figure 5 is a side elevation of a modified form of the invention, and

Figure 6 is a top plan view thereof.

Specifically describing the illustrated embodiment of the invention, my casting backmg is shown as comprising a plate 1 having 1931. Serial No. 547,911.

in one side thereof a plurality of undercut or thereof and. which provide between them projections 3 and surfaces 4 in spaced and opposed or oblique relation to the general plane of said side'of the plate. a

The opposite side of the plate has projecting therefrom a longitudinal web 5 at the outer edge ofwhich is an enlarged longitudinal head 6, preferably approximately cylindrical in shape. The web 5 and head 6 form a post to slidably enter a correspondingly shaped opening in an artificial tooth facing 7 indicated by dot and dash lines in Figures 1 to 3, inclusive. The general shape of the post and its combination thereof with a tooth facing is known in the art, and no claim to novelty is made thereon.

The purpose of the undercut recesses or grooves 2 and the surfaces at, is to provide an interlocking connection between the casting backing and casting metal or solder 8 which is utilized in making bridges and other dentures. As shown in Figures 1 to 3, inclusive, the casting metal or solder when in molten condition and during the casting operation, flows into the grooves 2 and into contact with the surfaces 4: so that a secure interlock is provided between the casting backing and the casting metal 8.

P *eferably the castin backing is made of metal which does not readily oxidize, so that the hot casting metal or solder will tightly adhere to the surfaces of the plate 1 and provide almost integral connection of the cas ing metal with the casting backing.

A modification of the invention is shown in in Figures 5 and 6 of the drawing, wherein the plate is provided with a dove-tail rib or projection 9 on the side opposite the toothh-olding means 5, 6, said rib having undercut side surfaces 10 disposed in spaced and opposed relation to the general plane of the corresponding side of the plate. This rib 9 ill interlock with casting metal or solder in the same manner as the projections 3.

It will be understood by those skilled in the. art that the casting operation, that is, the uniting of the casting backing with the of the prior art.

casting metal 8 or solder, is performed in the usual manner.

While I have shown and described the recesses 2 as extending transversely of the plate, it is of course Within the scope of the invention to arrange'said recesses diagonally and to provide criss-cross or intersecting recesses, and instead of the recesses 2 or the projec 'tions '3 or rib 9, the plate might be formed With projections or recesses oiiother shapes.

Therefore, I do not desire to he understood as limiting myself in the construction'of my invention except as maybe required by the following claim when construed in the light Havingthus described the invention, What 'I claim is:

A castingbackingfor artificialteeth, co1nprising a plate having undercut recesses 011 *oneside extending entirely across the plate and opening through the edges thereof to receive and interlock with casting metal or solder, saidplate beingprovided on'the opposite-side with means for holding a tooth.

STEPHEN J. KRIVIG. 

